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Freiburg 2024 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 37: Poster III

Q 37.12: Poster

Mittwoch, 13. März 2024, 17:00–19:00, Tent B

Suppression of Servo-Phase Noise for High-Fidelity Rydberg ExcitationsPhilipp Herbig1, Ben Michaelis1, Nejira Pintul1, Tobias Petersen1, Jonas Rauchfuß1, Oscar Murzewitz1, Clara Schellong1, Jan Deppe1, Till Schacht1, Alexander Ilin1, •Koen Sponselee1, Klaus Sengstock1,2, and Christoph Becker1,21Center for Optical Quantum Technologies, Hamburg, Germany — 2Institute for Quantum Physics, Hamburg, Germany

Neutral-atom quantum computers require highly-stable lasers for resonant excitation, which is usually achieved with a Pound-Drever-Hall (PDH) locking scheme. However, this feedback scheme creates servo bumps, which can severely limit excitation fidelities if the servo bandwidth frequency is similar to the Rabi frequency. A feed-forward scheme by Li et al. [1] supresses these servo bumps, and is here implemented in our Ytterbium quantum-computing experiment.

We are setting up our experiment to trap neutral 171-Ytterbium atoms in optical tweezers, providing several options for qubits. A 301.5 nm laser can then be used to excite 3P0 state atoms to an (n>50) 3S1 Rydberg state, entangling two neighbouring qubits with expected Rabi frequencies on the order of MHz. The fundamental of this laser is first stabilised to a cavity with a PDH lock. The servo bumps, about 500 kHz away from the carrier, are supressed by more than 20 dB using this scheme [1]. Simulations indicate that this method leads to significantly better excitation fidelities.

[1] Li et al., PRA 18, 064005 (2022)

Keywords: Quantum computing; Rydberg; Ytterbium; High fidelity; Quantum computer

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